| 1: | What are the signals on the physical layer provided by DTE? |
| A1: | Data Terminal Ready (DTR) and Request To Send (RTS). |
| 2: | What are the two available options for 56-kbps configurations for Cisco routers? |
| A2: | 56-kbps DSU/CSU and 56-kbps switched modes. |
| 3: | In the command service-module 56k network-type dds , what is DDS and what are the data rates provided by DDS? |
| A3: | DDS stands for Dataphone Digital Service and provides rates between 2.4 Kbps and 56 Kbps. |
| 4: | Serial 1 is configured with the command service-module t1 timeslots 1-2 . What is the configured bandwidth on Serial 1? |
| A4: | 64 x )2 = 128 kbps. |
| 5: | Name the WIC T1 Pinouts (8 pin RJ48S). |
| A5: | 1, 2, 4, and 5. |
| 6: | What is the command to loopback your equipment? |
| A6: | loopback dte |
| 7: | Name two checkpoints for a failing CSU. |
| A7: | Line or internal clocking and impedance mismatch. |
| 8: | In the show frame-relay map IOS command, if the DLCI is defined and active, what does this mean? |
| A8: | The message defined and active indicates that the DLCI can carry data and that the router at the far end is active. |
| 9: | What happens with the incoming DLCI in the switch? |
| A9: | The incoming DLCI number changes to match the far-end of the connection. Before sending the frame, the switch recalculates the new FCS and replaces this portion in the outgoing frame. It then sends the frame out. |
| 10: | How do you know if the DLCI is active but not configured in the router? |
| A10: | Type #show frame-relay pvc and check for an unused, active non-zero value. |
| 11: | Under what conditions does the properly configured LMI in a Cisco router not send packets over the DLCI? |
| A11: | When the PVC is listed as inactive or deleted. |
| 12: | Which LMI message reports the PVC status for each PVC configured on the interface? |
| A12: | The full status message. |
| 13: | What is the order of the Cisco LMI autosense full status enquiry message? |
| A13: | The order is ANSI , ITU, and Cisco. |
| 14: | How are "Num Status Enq. Sent," "Num Status msgs Rcvd," and "Num Status Timeouts" related in erroneous conditions? |
| A14: | In erroneous conditions "Num Status Enq. Sent" = "Num Status msgs Rcvd" + "Num Status Timeouts." |
| 15: | When debugging the serial interface, what does the message "illegal serial line type xxx" mean? |
| A15: | The message indicates that the encapsulation is Frame Relay or HDLC, and the router attempts to send a packet with an unknown packet type. |
